Remote reproduction of images
AssigneeMatra
InventorPierre Cassagne
Life of this patent
Estimating the term…
Abstract
An image represented by samples N.sub.o,o, N.sub.2,o, . . . , N.sub.2p,o, . . . , N.sub.o,2, . . . , N.sub.o,2q, . . . , N.sub.2p,2q, . . . , distributed over a two-dimensional pattern and each represented by a quantified signal, generally at two levels, is restored. From samples such as N.sub.2p,2q, are reconstituted samples such as m.sub.2p,2q, m.sub.2p+1,2q, m.sub.2p,2q+1, m.sub.2p+1,2q+1, quadruple in number. The values of the four samples are generated according to the expansion relationships: ##EQU1## The samples N are typically obtained by a compression process.
Claims7
Apparatus for the reconstitution of an image from binary signals N.sub.o,o, N.sub.2,o, . . . , N.sub.2p,o, . . . , N.sub.o,2q;
- N.sub.2p,2q representing samples of the image distributed over a two-dimensional matrix, comprising a clock at double the frequency of appearance of the elements N, a direct channel comprising a first shift memory with more than one and less than four one bit positions;
- a delayed channel comprising a cascaded arrangement of a shift register with a number of one-bit positions equal to the number of elements of a complete line of said image line and a second shift memory with a number of one-bit positions equal to those of the first shift memory, means for applying the elements N to said direct channel and delayed channel, clock means synchronized with the frequency of appearance of the elements N for controlling shift of said register and said memories and a set of logic gates connected to said memories to provide, in time alternation, two of the terms m of the following expansion relationship, and then two other terms,
- m.sub.2p,2q =N.sub.2p,2q +[N.sub.2(p+1),2q .times.N.sub.2p,2(q+1) ],
- m.sub.2p+1,2q =N.sub.2(p+1),2q +[N.sub.2p,2q .times.N.sub.2(p+1), 2(q+1) ],
- m.sub.2p,2q+1 =N.sub.2p,2(q+1) +[N.sub.2p,2q .times.N.sub.2(p+1),2(q+1) ],
- m.sub.2p,2q+1 =N.sub.2(p+1),2(q+1) +[N.sub.2(p+1),2q .times.N.sub.2p,2(q+1) ];
- said signals m being representative of samples distributed over a matrix homothetic with that of the samples represented by the signals N, and buffer-registers connected to receive said terms in sequence.
Dependencies are inferred from the claim text.